Earth potential rise — In electrical engineering, Earth Potential Rise (EPR) also called Ground Potential Rise (GPR) occurs when a large current flows to earth through an earth grid impedance. The potential relative to a distant point on the Earth is highest at the… … Wikipedia
Ground Potential Rise — Articles on Ground Potential Rise include: * Earth potential rise * High Voltage Isolation and Ground Potential Rise … Wikipedia
High Voltage Isolation and Ground Potential Rise — This article outlines the principles of High Voltage Isolation (HVI) and Ground Potential Rise (GPR). Most often questions of concern arise to anyone associated with the use of any communication signal (analog or digital) via a metallic or fiber… … Wikipedia
Earth Hour — is an annual international event created by WWF (The World Wide Fund for Nature/World Wildlife Fund), held on the last Saturday of March, that asks households and businesses to turn off their non essential lights and electrical appliances for one … Wikipedia
Single-wire earth return — (SWER) or single wire ground return is a single wire transmission line for supplying single phase electrical power from an electrical grid to remote areas at low cost. It is principally used for rural electrification, but also finds use for… … Wikipedia
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… … Wikipedia
Potential energy — This article is about a form of energy in physics. For the statistical method, see Potential energy statistics. Classical mechanics Newton s Second Law … Wikipedia
Rise of Rome — The rise of Rome to dominate the overt politics of Europe, North Africa and the Near East completely from the 1st century BC to the 4th century AD, is the subject of a great deal of analysis by historians, military strategists, political… … Wikipedia
Earth exploration — Introduction the investigation of the surface of the Earth and of its interior. By the beginning of the 20th century most of the Earth s surface had been explored, at least superficially, except for the Arctic and Antarctic regions. Today the… … Universalium
Rise of Nations — Infobox VG title = Rise of Nations developer = Big Huge Games publisher = Microsoft Game Studios designer = Brian Reynolds engine = version = 02.04.04.2903 released = vgrelease|North America|NA|May 20, 2003 vgrelease|Europe|EU|May 23, 2003 genre … Wikipedia